Sistemas Operativos Y Redes

LM40X21A
LCD Data Sheet
FEATURES • STHC (Super Twisted High Contrast) Yellow Green Transmissive Type • Low Power Consumption • Thin, Lightweight Design Permits Easy Installation in a Variety of Equipment • General-Purpose CMOS: – The Unit can be Easily Interfaced to a Microcomputer with Common 4-Bit and 8-Bit Parallel Inputs and Outputs • Built-in Character Generator ROM, RAM, and Display DataRAM: – Character Generator ROM – 160 Different 5 × 7 Dot Matrix Character Patterns – Character Generator RAM – Eight Different, User-Programmed 5 × 7 Dot Matrix Patterns (Write Capability by Program) – Display Data RAM – 80 × 8 bits

Dot Matrix LCD Unit
• Extensive Instruction Set: – Display Clear, Cursor Home, Display ON/OFF, Cursor ON/OFF, Character Blink, Cursor Shift, and Display Shift •Internal Automatic Reset Circuit at Power-On • Operates From a Single 5 V Power Supply and Incorporates an LCD Panel Which Provides a Highly Stable Display Over a Wide Range of Temperatures DESCRIPTION
The SHARP LM40X21A Dot Matrix LCD Unit consists of a combination of a 5 × 7 dot 40-character 2-line dot matrix LCD panel, LCD driver, and controller LSI and yellow green backlight LED mounted on asingle printed circuit board. Incorporating mask ROM-based character generator and display data RAM in the controller LSI, the unit is capable of efficiently displaying the desired characters under microcomputer control. LCD is positive type.

LCD Data Sheet

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LM40X21A

Dot Matrix LCD Unit

VLED VLSS

LED BACKLIGHT LCD PANEL 40 CHARACTERS 2-LINES SCAN SIGNAL RF 40 40 40 DISPLAYSIGNAL DISPLAY SIGNAL DISPLAY SIGNAL 40 40 DISPLAY SIGNAL 16

RS, R/W, E

CONTROL SIGNAL

3

DISPLAY SIGNAL

IC1 DATA SIGNAL 8

DB0 - DB7

DISPLAY DATA +TIMING SIGNAL 4

IC2

4

IC3

4

IC4

4

IC5

LCD DRIVE BIAS VOLTAGE

VDD V0 VSS NOTE: RF is an internal oscillating resistor. BIAS VOLTAGE GENERATOR CIRCUIT

5019-5

Figure 1. LM40X21A Block Diagram

Page 2LCD Data Sheet

Dot Matrix LCD Unit

LM40X21A

MECHANICAL SPECIFICATIONS
PARAMETER SPECIFICATIONS UNIT NOTE

Outline Dimensions Active Area Display Format Character Format Character Size Dot Size Dot Spacing Character Color Backlight Color Weight

182 (W) × 33.5 (H) × 16 max (D) 154.4 (W) × 15.8 (H) 40 characters × 2 lines 5 × 7 dots, with cursor 3.2 (W) × 4.85 (H) (5 × 7 dots) 0.6(W) × 0.65 (H) 0.05 Dark blue Yellow Green Approximately 90

mm mm – – mm mm mm – – g

– – – – – – – 1 – –

NOTE: 1. Due to the characteristics of the LC material, the color varies with the environmental temperature.

ABSOLUTE MAXIMUM RATINGS
SYMBOL PARAMETER MIN. MAX. UNIT NOTE

V DD – V SS V O – V SS ILED V IN Tstg Topr V LED – V LSS

Supply Voltage (Logic) Supply Voltage (LCD Drive)Supply Current (Backlight LED) Input Voltage Storage Temperature Operating Temperature Reverse Voltage (Backlight LED)

−0.3 0 – −0.3 −25 0 –5

+6.5 +6.5 400 VDD +0.3 +70 +50 –

V V mA V °C °C V

– VDD > V0 tA = 25°C – – – –

LCD Data Sheet

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LM40X21A

Dot Matrix LCD Unit

ELECTRICAL CHARACTERISTICS (tA = 25°C)
SYMBOL PARAMETER MIN. TYP. MAX. UNIT NOTE

V DD – VSS V O– V SS V IL V IH V OL V OH IIL fOSC IDD ILED PD V LED – V LSS

Supply Voltage (Logic) Supply Voltage (LCD Drive) Input Voltage ‘L’ ‘H’ Output Voltage Input Leakage Current Internal Oscillating Frequency Supply Current ‘L’ ‘H’

4.75 – −0.3 − 2.2 – 2.4 – –

5.0 0.65 – – – – – 160 2.4

5.25 – 0.6 V DD 0.4 – 1 – 3.5 400 2017.5 5.25

V V V V V V µA kHz mA mA mW V

– VDD = 5.0 V Note 1 – – IOL= 1.2 mA IOH = -0.205 mA – – VDD = 5.0 V VO = 0 V VLED – V LSS = 5.0 V VDD = 5.0 V, V O = 0 V VLED – V LSS = 5.0 V –

– Power Dissipation Supply Voltage (Backlight LED) – 4.75

300 1512 5.0

NOTE: 1. When more than 60 minutes have elapsed since backlighting began.

INTERFACE TIMING (VDD = 5.0 V ±5%, tA = 0 to 50°C) °
SYMBOL PARAMETER MIN. TYP. MAX. UNIT

tCYCE PWEH tER , tEF tAS...